1. Andersen, J. H., L. Schlüter & G. Ærtebjerg, 2006. Coastal eutrophication: recent developments in definitions and implications for monitoring strategies. Journal of Plankton Research 28: 621–628.
2. Anon., 1991a. Council Directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC). Official Journal L 135.
3. Anon., 1991b. Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources. Official Journal L 375.
4. Anon., 2000. Directive 200/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Official Journal L 327/1.
5. Anon., 2003. Common Implementation Strategy for the Water Framework Directive (2000/60/EC). Guidance on typology, reference conditions and classification systems for transitional and coastal waters. Produced by Working Group 2.4 — Coast.